<ui:composition
        xmlns:ui="http://java.sun.com/jsf/facelets"
        xmlns:h="http://java.sun.com/jsf/html"
        xmlns:f="http://java.sun.com/jsf/core"         >

  <f:view renderKitId="PRIMEFACES_MOBILE">
        //content
  </f:view>
    
</ui:composition>